1 /*
2 * Copyright (c) 2001, 2008, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 // A GenRemSet provides ways of iterating over pointers accross generations.
26 // (This is especially useful for older-to-younger.)
27
28 class Generation;
29 class BarrierSet;
30 class OopsInGenClosure;
31 class CardTableRS;
32
33 class GenRemSet: public CHeapObj {
34 friend class Generation;
35
36 BarrierSet* _bs;
37
38 public:
39 enum Name {
40 CardTable,
41 Other
42 };
43
44 GenRemSet(BarrierSet * bs) : _bs(bs) {}
116 // younger than gen from generations gen and older.
117 // The parameter clear_perm indicates if the perm_gen's
118 // remembered set should also be processed/cleared.
119 virtual void clear_into_younger(Generation* gen, bool clear_perm) = 0;
120
121 // Informs the RS that refs in the given "mr" may have changed
122 // arbitrarily, and therefore may contain old-to-young pointers.
123 // If "whole heap" is true, then this invalidation is part of an
124 // invalidation of the whole heap, which an implementation might
125 // handle differently than that of a sub-part of the heap.
126 virtual void invalidate(MemRegion mr, bool whole_heap = false) = 0;
127
128 // Informs the RS that refs in this generation
129 // may have changed arbitrarily, and therefore may contain
130 // old-to-young pointers in arbitrary locations. The parameter
131 // younger indicates if the same should be done for younger generations
132 // as well. The parameter perm indicates if the same should be done for
133 // perm gen as well.
134 virtual void invalidate_or_clear(Generation* gen, bool younger, bool perm) = 0;
135 };
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1 /*
2 * Copyright (c) 2001, 2010, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #ifndef SHARE_VM_MEMORY_GENREMSET_HPP
26 #define SHARE_VM_MEMORY_GENREMSET_HPP
27
28 #include "oops/oop.hpp"
29
30 // A GenRemSet provides ways of iterating over pointers accross generations.
31 // (This is especially useful for older-to-younger.)
32
33 class Generation;
34 class BarrierSet;
35 class OopsInGenClosure;
36 class CardTableRS;
37
38 class GenRemSet: public CHeapObj {
39 friend class Generation;
40
41 BarrierSet* _bs;
42
43 public:
44 enum Name {
45 CardTable,
46 Other
47 };
48
49 GenRemSet(BarrierSet * bs) : _bs(bs) {}
121 // younger than gen from generations gen and older.
122 // The parameter clear_perm indicates if the perm_gen's
123 // remembered set should also be processed/cleared.
124 virtual void clear_into_younger(Generation* gen, bool clear_perm) = 0;
125
126 // Informs the RS that refs in the given "mr" may have changed
127 // arbitrarily, and therefore may contain old-to-young pointers.
128 // If "whole heap" is true, then this invalidation is part of an
129 // invalidation of the whole heap, which an implementation might
130 // handle differently than that of a sub-part of the heap.
131 virtual void invalidate(MemRegion mr, bool whole_heap = false) = 0;
132
133 // Informs the RS that refs in this generation
134 // may have changed arbitrarily, and therefore may contain
135 // old-to-young pointers in arbitrary locations. The parameter
136 // younger indicates if the same should be done for younger generations
137 // as well. The parameter perm indicates if the same should be done for
138 // perm gen as well.
139 virtual void invalidate_or_clear(Generation* gen, bool younger, bool perm) = 0;
140 };
141
142 #endif // SHARE_VM_MEMORY_GENREMSET_HPP
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